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Are you sure the Powertank says to drain completely before charging David? That sounds more like old NiCad instructions. Usually these sorts of things contain SLAs (sealed lead acid), and you want to take out as little charge as possible each use, then recharge as quickly as possible.
If it is SLA, would be best to get it on charger and leave there as long as possible. Failing that, it might need a smarter multi-stage charger to kick start it back up over the min point at which basic chargers will start to work.
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